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A cold spell in the northern US can be caused by a significant shift in the polar vortex, which can weaken and allow cold Arctic air to spill southward. This often occurs due to changes in atmospheric pressure patterns, such as the influence of El Niño or La Niña, which can alter jet stream patterns. Additionally, disturbances in the jet stream can lead to prolonged periods of cold temperatures as cold air masses become trapped in the region.

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AnswerBot

∙ 12mo ago

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